Sanitary Engineering Laboratory, Department of Water Resources and Environmental Engineering, School of Civil Engineering, National Technical University of Athens, Athens, Greece.
Department of Biochemical Engineering, University College London, London, UK.
Environ Technol. 2024 Jan;45(1):73-86. doi: 10.1080/09593330.2022.2099311. Epub 2022 Jul 18.
One of the most recent innovations to promote a circular economy during wastewater treatment is the production of biopolymers. It has recently been demonstrated that it is possible to integrate the production of biopolymers in the form of polyhydroxyalkanoates (PHA) with nitrogen removal via nitrite during the treatment of sludge reject water. In the present study, simulation of a new process for bioresource recovery was conducted by an appropriate modification of the Activated Sludge Model 3. The process consists of the integrated nitrogen removal via nitrite from sludge reject water and the selection of PHA-storing biomass by inducing a feast and famine regime under aerobic and anoxic conditions. According to the results, it is anticipated that simulation data matched very satisfactorily with the experimental data and confirmed the main experimental observation, showing that during the famine period the PHA depletion was almost complete due to the availability of nitrite as the electron acceptor. Simulation results indicate that the selection of the volumetric organic loading rate and of the relative duration of the aerobic feast/anoxic famine duration is critical in order to allow for the effective denitritation of the internally stored PHA during the famine phase.
在废水处理过程中促进循环经济的最新创新之一是生产生物聚合物。最近已经证明，通过在污泥回流水中以亚硝酸盐的形式进行氮去除，可以将聚羟基烷酸酯 (PHA) 的生物聚合物生产与氮去除结合起来。在本研究中，通过对活性污泥模型 3 进行适当的修改，对生物资源回收的新工艺进行了模拟。该过程包括通过污泥回流水中的亚硝酸盐进行集成氮去除以及通过在有氧和缺氧条件下诱导饱食和饥饿状态来选择储存 PHA 的生物质。根据结果，可以预期模拟数据与实验数据非常吻合，并证实了主要的实验观察结果，即在饥饿期，由于亚硝酸盐作为电子受体的可用性，PHA 的消耗几乎是完全的。模拟结果表明，选择容积有机负荷率和有氧饱食/缺氧饥饿时间的相对持续时间是至关重要的，以便在饥饿阶段有效反硝化内部储存的 PHA。
